package old.apiday01;

public class StringStringBuilderDemo {
    public static void main(String[] args) {
        StringBuilder s=new StringBuilder("a");
        for (int i = 0; i < 10000; i++) {//10000次
            s.append(i);
        }
        System.out.println(s);
        System.out.println("执行完毕");
    }
}
